Fuel-oil strainer.



K. M. DAHL.

FUEL OIL STRAINER.

APPLICATION FILED 313.20, 1912 TITORNEY Patented Oct. 22, 1912.

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KNUT MARTIN DAIHL, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOB TO UNION IRONWORKS (10., OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF NEW JERSEY.

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Specification of Letters Patent.

Patented Oct. 22, 1912.

To all whom it may concern.

Be it known that I, KNUT MARTIN DAHL, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented a new. and useful Fuel-Oil Strainer, of which thefollowing is a specification.

My invention in its broad and generic scope comprises a novel fuel oilstrainer which is especially adapted to be employed in conjunctlon withoil burning systems and wherein any sediment or foreign materialcontained in the oil passin from the oil supply tank to the burners isremoved owing to the provision of a plurality of impurity collectingdevices, novel means being.

provided to enablethe operator to switch the fiow of oil from oneimpurity collecting means to another so that it is possible to haveoneof the' impurity collecting means inan operative and unobstructivecondition at all times and the operator is enabled to switch from oneimpurity collecting means to another without affecting in any manner theoperation of the entire plant.

It further consists of a novel construction of fuel oil strainer havinga novel construction of a valve controlling the passage of fuel to thestrainers and adapted to permit the oil to pass through and out of oneof the strainers and at the same time prevent the passage of the oil toanother strainer so that the operator can switch the flow of oil fromone strainer'into the other while cleaning any refuse out of a strainerthat may have become choked or clogged.

It further consists of a novel construction of a casing adapted toreceive a novel construction andarrangement of removable perforatedbaskets, and novel means for providing access to such baskets to permitthe same to be inserted or removed.

It further consists of a novel construction of a fuel oil straineradapted to receive a novel construction of a plurality of filters and anovel construction of closure and actuating means therefor, whereby boththe closure and the actuating means are bodily removable as a unit ofstructure thereby eliminating-the liability of the parts becomingseparated when removed and also elimi nating the necessity of theoperator carrying an independent actuating wrench.

It further consists of other novel features of construction, all as willbe hereinafter fully set forth.

For the purpose of illustrating my invention, I have shown in theaccompanying drawing one form thereof which is at present preferred byme, since the same has been found in practiceto give satisfactory andreliable results, although it is to be understood that the variousinstrumentalitios of which my invention-consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Figure 1 represents a sectional elevation of a fuel oil strainerembodying my-invention. Fig. 2 represents a top plan view thereof. Fig.3 represents a section on line a1-m Fig. 2. Fig. 4. represents a sectionon line yy Fig. 1. Fig. 5 represents a section on line z-z Fig. 1.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings, 1 designates a casing of a fuel oil strainerembodyin my invention, the same being illustrated as consisting of acasting provided with an inlet 2 and an outlet 3 which are adapted to beconnected to the oil conduit between the oil supply tank and the burnersin any desired or conventional manner. The casing 1 may have any desiredcontour but, in the present instance, the same is shown as beingprovided with the lateral extensions 4 and 5, the outer portions of suchextremities being preferably rounded, although in the broad scope of myinvention the shape of the same is immaterial. I The central portion ofthe casing 1 forms an annular wall 6 thereby forming chambers orcompartments? and 8. The Wall 6, in the present instance, hasthe upperportion of its internal periphery forming a tapering or conical hearingor seat 9 while the lower wall thereof is substantially vertical asindicated at. 10.

11 designates a laterally extending flange carried by the wall 6intermediate its lower portion and, in the present instance, the flangeextends outwardly and upwardly and forms an integral part of the annularrib or flange 12. The compartment 7 is provided with an inlet port 13located above the flange 11 and an outlet port 14: located below theflange 11 while the compartment 8 erate with the conical seat 9 oflthecasing.

The valve 17 is provided with an upper chamber 18 the bottom of which isclosed by a laterally extending diaphragm 19, said chamber 18 beingprovidedwith a plurality of ports 20 and 21 which are spaced apart insuch a manner that when one of the ports communicates with the maininlet 2 then the other port will communicate with either the inlet 13 or15. The inner or lower end of the valve 17 is chambered as indicated at22 and is provided with a plurality of ports 23 and 24 one of whichcommunicates with a chamber 25 leading to the outlet 3 w'hile at thesame time the other port will oommunicate with either the port 14 or 16.

The plug valve 17 is provided with a stem 26 adapted to receive a plate27 which is secured to the casing 1 by means of suitable fasteningdevices 28 as will be understood by reference to Fig. 2. The plate 27 isprovided with a recess 29 into which the dc pending things of a gland 30is adapted toextend, said gland having bolts '31 passing therethroughwhich are in threaded engagement with the plate 27. The :gsland '30 iscut away to form shoulders 82 and '33 thereby serv-ing as stops for alag or stop 34 carried by a handle 35 which latter is adapted to besecured with respect to the outer end of the stem 26 in any desiredmanner.

36 and 37 desi'gna te two or more filtering devices of any desiredcharacter but shown in the present instance as consisting of baskets orstrainers which are preferably constructed of tin, zinc crothersuitwblematerial and since each one is constructed in a similar manner, I havedeemed it necessary to describe in detail but one of the same. Thebaskets are each provided with a closed bottom 38 and the sides thereofare vprovided with -a desired number of perforations 39. At the upperend of the strainers is secured in any desired manner a flange orbracket 40 which is adapted to seat on the flanges 11 and 12 and, in thepresent instance, I have shown the flanges 40 as having an angularcontour. v

41 designates a handle or bail secured to the sides of each basket.

42 and 43 designate openings the upper part of the casing which areadapted to be sealed by closures or covers 44 and 45 respectively whichlatter are each constructed in a similar manner and provided on theirinner face with a lug or boss 46 which engages the handle 41 to maintainthe strainer to which it is attached in assembled position. The meansfor holding the strainers in position are constructed in a similarmanner and I will therefore give to the same the same referencecharacters. The

upper face of each closure is inwardly re .cessed as at 47 to provide achamber for the reception of a nut 48 which latter is in engagement witha bolt or stud 49 and each nut 48 is prevented from disengagement withthe recess 47 owing tothe provision of a plate 50 secured to the closurein any desired manner and through which the reduced end of the stud 49passes, said stud having an arm 51 passing therethrough which, in thepresent instance, has a working fit in an aperture in the head of thestud 49 and is suitably headed to prevent such arm disengaging fromitsstud. Each stud 49 is in threaded engagement with a cross bar 52having a recess 53 at one end thereof while the opposite end thereof isprovided with a recess 54 which presents its open side in a diroot-ionopposite to that of the recess 53.

55 and 56 designate studs in threaded engagement with the casing l andeach oil these is provided with a reduced neck 57 whereby when a crossbar 52 is properly actuated the recessed portions 53 and 54 of suchcross bar will interlock with the studs 55 and 56 respectively, it beingunderstood that when the cross bar is in such a position the closureconnected therewith will be forced toward or away from the casing 1 onthe rotation of a stud 49.

The operationof my novel fuel oil strainer will now be readily apparentto those skilled iii the art to which this invention appertains and isas fol-lows :The casing 1 is connected in the fuel conduit intermediatethe burner and the tool supply tank. Assuming that the actuating handle35 has been manually aotuated to bring the inlet port 21 in alinementwith the main inlet 2 then the oil may pass through the inlet 2 into thechamber 18 of the valve thence through the port 20 in the valve and port18 in the casing and thence through the strainer 36 which any sedimentor foreign matter will be removed and the oil in its purified andfiltered condition will pass into the chamber 7 thence through theoutlet port 14,.po1rt23 of the valve into the chamber 25, and thencethrough the main outlet 3 to a desired point of utilization, such as forexample the burn ers. If the strainer 36 for any reason hecomesclogged-or .it is desired to remove such strainer for any purpose, thehandle 35 is actuated to bring the stop 34 against the, shoulder 38whereupon the ports 13 and "14 will be closed and the ports 15 and 16 inthe casing will communicate with the .ports'2l and 24 respectively sothat the oil will now pass through the strainer 37 into the chamher 8and thence through the port 16., port main outlet 3 to a desired pointof utilization.

It will be evident that by such a construction I provide an arrangementwhereby the operator is enabled to switch the flow of oil from onefiltering mechanism into another so that the refuse in a filteringmechanism which has become choked or clogged may be removed, and one isenabled to have one of the strainers, such as 36 and 37, in an operativecondition at all times and to switch from one filtering device toanother without shutting down the plant or effecting in any manner itsoperation.

Special attention is directed to the fact that the closure, stud andhandle over each filtering device are so arranged that they cannotbecome separated when removed thereby preventing the possible loss ofindividual parts and also eliminating the necessity of the operatorcarrying a wrench with him. Special attention is also directed to thenovel, manner in which the filtering devices are mounted within thecasing, it being noted that a practically unobstructed passage for theoil is provided and since the closure engages the handle or bail of afiltering device such filtering device is positively prevented from anyimproper relative movement. Special attention is also directed to thenovel construction of valve employed and while, in the present instance,I have shown the valve as adapted to control the flow of oil to but twocompartments, it is apparent that in the broad scope of my invention.any desired number of compartments and separate filtering devices maybe employed and the same will be within the broad scope of my invention.It will further be evident that owing to the novel construction offiltering devices and the novel construction of closures therefor, thatthe samemay be readily removed or inserted when desired since it is onlynecessary to actuate the stud or bolt 49 and then rot-ate the cross bar52 to cause the ends thereof to unlock from or interlock with studs 55and 56 respectively whereupon the closure, the cross bar and thefastening stud may be bodily removed as a unit of structure and permitthe removal of a filtering device such as 36 or 37 which hasbecomeclogged.

While I have, in the present instance, shown and described a preferredembodiment of a fuel oil strainer which has been found in practice togive satisfactory and ing intermediate of and separating said strainerchambers, said annular casing having its inner face forming a valve seatprovided at its upper'portion with a main inlet port and at its lowerportion with a main discharge port, and having an inlet andan outletport leading to each strainer chamber, each chamber having an inwardlyextending flange between its inlet and outlet port, strainers seated onsaid flanges, and a valve co-acting with said seat and having an upperinlet and an upper discharge port registering respectively with the maininlet port and a strainer chamber inlet port, said valve having itslower end provided with a common outlet chamber, and a portcommunicating with such chamber through the side of the valve andadapted to register with one or the other of said strainer chamberoutlet ports.

2. In an oil strainer, a casing having an internal cylindrical wall, theupper portion of which is conical and forms a plurality of strainerchambers, said wall having its inner face forming a valve seat providedwith a main inlet port and a main discharge port and having an inlet andan outlet port leading to each chamber, each chamber having an inwardlyextending flange between its inlet and outlet port, strainers seated onsaid flanges, and a valve co-acting with the conical portion of saidwall and having an upper inlet and an upper discharge port registeringrespectively with the main inlet port and one of the inlet ports of astrainer chamber, and having its extreme end recessed, and a portcommunicating with such recess through the side of the valve and adaptedto register with one of the outlet ports from a strainer chamber.

KNUT MARTIN DAHL.

Witnesses FREDERICK BIRDSALL, MAURICE ASHER.

